Here is an example of the quest to boost high-band gain by adding antenna bling in the form of folded dipole loops tuned for high band
jfd 1.jpg.
This is a later version of a broadband VHF antenna
jfd 2.jpg
using a helical high-band (zig-zag) very common in the early 1960's.
Both these VHF antennas have companion a UHF antenna. This is none other than JFD's unique version of the super-efficient bow-tie corner reflector.